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A bright and moisture-resistant red-emitting Lu3Al5O12:Mn4+,Mg2+ garnet phosphor for high-quality phosphor-converted white LEDs

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Abstract

The rational and delicate synthesis of Mn4+ activated red-emitting oxide phosphors with high photoluminescence quantum yield (PLQY) and photo-stability for developing high-quality w-LEDs still remains a great challenge. Herein, we demonstrate a simultaneous ion co-substitution design strategy to synthesize a red-emitting Lu3Al5O12:Mn4+,Mg2+ garnet phosphor delicately with the assistance of MgF2. The Mn4+ activated garnet phosphor exhibits superior moisture resistance properties and high PLQY (ca. 72.41%), which emits a bright and narrow-band red light peaking at ∼670 nm due to the 2E–4A2 spin-forbidden transition of Mn4+ upon UV excitation. Remarkably, MgF2 as a charge compensator & flux can not only accelerate the solid state reaction, but also greatly improve the emission intensity. Furthermore, by employing the as-prepared Lu3Al5O12:Mn4+,Mg2+ as a red component, we fabricate a warm w-LED with a high color rendering index (Ra = 81.4) and low color temperature (CCT = 4766 K) based on a UV chip and commercial blue and yellow phosphors.

Graphical abstract: A bright and moisture-resistant red-emitting Lu3Al5O12:Mn4+,Mg2+ garnet phosphor for high-quality phosphor-converted white LEDs

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Publication details

The article was received on 07 Jun 2017, accepted on 26 Jul 2017 and first published on 27 Jul 2017


Article type: Paper
DOI: 10.1039/C7TC02514A
Citation: J. Mater. Chem. C, 2017, Advance Article
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    A bright and moisture-resistant red-emitting Lu3Al5O12:Mn4+,Mg2+ garnet phosphor for high-quality phosphor-converted white LEDs

    Y. Chen, K. Wu, J. He, Z. Tang, J. Shi, Y. Xu and Z. Liu, J. Mater. Chem. C, 2017, Advance Article , DOI: 10.1039/C7TC02514A

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